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Rupert Neve Designs Portico 500 Series Operation Manual

Mic pre with silk
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Portico 511
500 Series Mic Pre with Silk
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Operations Manual

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Summary of Contents for Rupert Neve Designs Portico 500 Series

  • Page 1 Portico 511 500 Series Mic Pre with Silk Serial #: Operations Manual...
  • Page 2 Thank you for your purchase of the 511: 500 Series Mic Pre with Silk. Everyone at Rupert Neve Designs hope you enjoy using this tool as much as we have enjoyed designing and building it. Please take note of the following list of safety concerns and power requirements before the use of this or any Portico Series product.
  • Page 3 PORTICO 511: FRONT PANEL Rupert Neve Designs MIC PRE + SILK POWER TRIM LEVEL GAIN 20Hz 250Hz TEXTURE SILK PORTICO 511: BLOCK DIAGRAM CONTINUOUS TR IM +/-6dB OUTPUT STAGE PHASE HPF ENGAGE OUT PUT TRANS FORME R +INP UT OUT PUT 20Hz - 250Hz TR IM STEPPED GAIN...
  • Page 4 DESIGN NOTES FROM MR. RUPERT NEVE From Rupert Neve: In former years, before the introduction of solid state amplifiers, transformers were necessary to step down from the very high input impedance of tubes, and to provide a balanced input for the microphone line. An input impedance of 1,000 or 1,200 ohms became established for microphones having a source impedance of 150 or 200 ohms, with connection being made on a twisted twin screened cable (This type of cable, while excellent for low impedance work,...

  • Page 5: Dynamic Range

    DYNAMIC RANGE Traditionally, high quality microphones such as ribbons, had very low source impedances – as low as 30 ohms at the output of a ribbon matching transformer. Moving coil microphones were higher impedance, but had not been standardized as they are today. Condenser microphones, before the days of semiconductors, used tube pre-amplifiers that were coupled to the outgoing line with an impedance matching transformer.
  • Page 6 under 20 to 30 dB of noise. And we know that most gain stages exhibit rising distortion at higher frequencies, including more IM distortion. One common IM test is to mix 19 kHz and 20 kHz sine waves, send them through a device and then measure how much 1 kHz is generated (20-19=1).

  • Page 7: Microphone Input

    1. Tsutomu Oohashi, Emi Nishina, Norie Kawai, Yoshitaka Fuwamoto, and Hishi Imai. National Institute of Multimedia Education, Tokyo. “High Frequency Sound Above the Audible Range,Affects Brain Electric Activity and Sound Perception” Paper read at 91st. Convention of the A.E.S.October 1991. Section 7. (1), Conclusion. 2.

  • Page 8: Specifications

    +48V Engages phantom power on the microphone input, as supplied by the 500 series rack. POLARITY Push button inverts the polarity of the signal path, and illuminates when engaged. The symbol “Ø” is often used to denote opposite polarity. HIGH PASS FILTER The high pass filter is continuously variable from 20-250Hz and engaged by the HPF switch, which illuminates when engaged.

  • Page 9: Phantom Power

    MAXIMUM OUTPUT LEVEL +23dBu TOTAL HARMONIC DISTORTION AND NOISE @ 1kHz, +20dBu output level, no load. Better than 0.0025% @ 20Hz, +20dBu output level, no load. 0.025% Typical (2nd and 3rd harmonic) TOTAL HARMONIC DISTORTION AND NOISE WITH SILK ENGAGED TEXTURE @ min @ 100Hz, +20dBu input level, no load 0.015%, mostly 3rd...

  • Page 10: Product Warranty

    PRODUCT WARRANTY Rupert Neve Designs warrants this product to be free from defects in materials and workmanship for a period of three (3) years from date of purchase, and agrees to remedy any defect identified within such three year period by, at our option, repairing or replacing the product.

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Portico 511

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